Polarizing the Dynamo

[D&J Edgar]

Sorry to interrupt the Morgan discussion but I have a MG TC question here. I am doing some research on polarizing the TCs dynamo. While I know the proper way is to disconnect the field wire at the control box and flash it to a battery source, are there other acceptable ways of doing this? One way in particular intrigued me, but don't know if it is true, was to merely push the cut-out contacts closed. While I believe this would polarize the dynamo I am not sure if such action would cause any harm like maybe causing the points to stick and maybe burning up windings. Has anyone tried this with favorable results or have other polarizing methods? And now back to the Morgan construction thread, David Edgar, TC 5108 El Cajon, California

[Terry Sanders]

Dave, if you push the cutout closed with the dynamo not turning, you are putting a dead short on the unit which will surely melt the contacts of the cut out. Only the fields of the dynamo should be flashed as this is where the magnetism resides. Terry D&J Edgar djedgar@pacbell.net> wrote: Sorry to interrupt the Morgan discussion but I have a MG TC question here. I am doing some research on polarizing the TCs dynamo. While I know the proper way is to disconnect the field wire at the control box and flash it to a battery source, are there other acceptable ways of doing this? One way in particular intrigued me, but don't know if it is true, was to merely push the cut-out contacts closed. While I believe this would polarize the dynamo I am not sure if such action would cause any harm like maybe causing the points to stick and maybe burning up windings. Has anyone tried this with favorable results or have other polarizing methods? And now back to the Morgan construction thread, David Edgar, TC 5108 El Cajon, California Yahoo! Groups Links [Non-text portions of this message have been removed]

[D&J Edgar]

Thanks Terry. My finger was itching to try but knew asking the group was the better way to answer my question. A puff of smoke would not have made my day. David Edgar, TC 5108 El Cajon, California

On 4/18/05 9:32 AM, "Terry Sanders" taterry@pacbell.net> wrote: > Dave, if you push the cutout closed with the dynamo not turning, you are > putting a dead short on the unit which will surely melt the contacts of the > cut out. Only the fields of the dynamo should be flashed as this is where the > magnetism resides. > Terry [Non-text portions of this message have been removed]

[1939mgtb]

Hi, Don't close the contacts, you will fry the contacts and windings. Use the jumper wire to dynamo connection method. Are we out of kit car comments? Good. Best regards, Ray "There are no easy answers in this case m'lud."

----- Original Message ----- From: "D&J Edgar" djedgar@pacbell.net> To: "TABC" mg-tabc@yahoogroups.com> Sent: Monday, April 18, 2005 11:10 AM Subject: [mg-tabc] Polarizing the Dynamo > > Sorry to interrupt the Morgan discussion but I have a MG TC question here. > > > I am doing some research on polarizing the TCs dynamo. While I know the > proper way is to disconnect the field wire at the control box and flash it > to a battery source, are there other acceptable ways of doing this? > > One way in particular intrigued me, but don't know if it is true, was to > merely push the cut-out contacts closed. While I believe this would > polarize the dynamo I am not sure if such action would cause any harm like > maybe causing the points to stick and maybe burning up windings. Has > anyone > tried this with favorable results or have other polarizing methods? > > And now back to the Morgan construction thread, > > David Edgar, TC 5108 > El Cajon, California > > > > > Yahoo! Groups Links > > > > > > >

[Bob Grunau]

I agree with Ray. Too many armature windings have been cooked when the cut-out does not open automatically or is manually closed with the engine not running. Bob Grunau Hi, Don't close the contacts, you will fry the contacts and windings. Use the jumper wire to dynamo connection method. Best regards, Ray

> > Sorry to interrupt the Morgan discussion but I have a MG TC question here. > > > I am doing some research on polarizing the TCs dynamo. While I know the > proper way is to disconnect the field wire at the control box and flash it > to a battery source, are there other acceptable ways of doing this? > > One way in particular intrigued me, but don't know if it is true, was to > merely push the cut-out contacts closed. While I believe this would > polarize the dynamo I am not sure if such action would cause any harm like > maybe causing the points to stick and maybe burning up windings. Has > anyone > tried this with favorable results or have other polarizing methods? >

[Donald Wilkinson]

digitaldon would like to demur with all the distinguished graybeards here. He has been using this method for decades. It is only necessary to slack off the dynamo, releasing the belt, then mash the cutout points. It is then not only instantly & easily polarized, but should happily motor away, thus confirming it's health, (if indeed it is OK). Don TC 7993 Hi, Don't close the contacts, you will fry the contacts and windings. Use the jumper wire to dynamo connection method. Are we out of kit car comments? Good. Best regards, Ray "There are no easy answers in this case m'lud."

----- Original Message ----- From: "D&J Edgar" djedgar@pacbell.net> To: "TABC" mg-tabc@yahoogroups.com> Sent: Monday, April 18, 2005 11:10 AM Subject: [mg-tabc] Polarizing the Dynamo > > Sorry to interrupt the Morgan discussion but I have a MG TC question here. > > > I am doing some research on polarizing the TCs dynamo. While I know the > proper way is to disconnect the field wire at the control box and flash it > to a battery source, are there other acceptable ways of doing this? > > One way in particular intrigued me, but don't know if it is true, was to > merely push the cut-out contacts closed. While I believe this would > polarize the dynamo I am not sure if such action would cause any harm like > maybe causing the points to stick and maybe burning up windings. Has > anyone > tried this with favorable results or have other polarizing methods? > > And now back to the Morgan construction thread, > > David Edgar, TC 5108 > El Cajon, California > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/mg-tabc/ To unsubscribe from this group, send an email to: mg-tabc-unsubscribe@yahoogroups.com Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/

[Bob Grunau]

OK, sure. But nobody said anything about removing the belt. And don't you have to cross connect the field and armature to make it motor? But why not just jumper the field? A lot easier, and safer, than removing the belt and mashing the points. Bob digitaldon would like to demur with all the distinguished graybeards here. He has been using this method for decades. It is only necessary to slack off the dynamo, releasing the belt, then mash the cutout points. It is then not only instantly & easily polarized, but should happily motor away, thus confirming it's health, (if indeed it is OK). Don TC 7993 Hi, Don't close the contacts, you will fry the contacts and windings. Use the jumper wire to dynamo connection method. Are we out of kit car comments? Good. Best regards, Ray

> I am doing some research on polarizing the TCs dynamo. While I know

the

> proper way is to disconnect the field wire at the control box and flash

it

> to a battery source, are there other acceptable ways of doing this? > > One way in particular intrigued me, but don't know if it is true, was

to

> merely push the cut-out contacts closed. While I believe this would > polarize the dynamo I am not sure if such action would cause any harm

like

> maybe causing the points to stick and maybe burning up windings. Has > anyone > tried this with favorable results or have other polarizing methods? > > And now back to the Morgan construction thread, > > David Edgar, TC 5108

&g

[D&J Edgar]

Don (and Bob too), If I am understanding this correctly by removing the fan/dynamo belt and freeing the dynamo to revolve, when you press the cut-out points together you are thus motorizing the dynamo and polarizing it at the same time. By not removing the belt one would fry the armature windings. Is there enough force in the motorization to also run the tach reduction gears and cable or is it advisable to remove those as well? This is great stuff, David Edgar, TC 5108 El Cajon, California

On 4/18/05 11:33 AM, "Donald Wilkinson" digitaldon@hotmail.com> wrote: > digitaldon would like to demur with all the distinguished graybeards here. > He has been using this method for decades. It is only necessary to slack > off the dynamo, releasing the belt, then mash the cutout points. It is then > not only instantly & easily polarized, but should happily motor away, thus > confirming it's health, (if indeed it is OK). > > Don > TC 7993

[1939mgtb]

Dunno Don. The gennie will convert to a motor OK, but every electrical book I can remember said use the jumper. And you can mis-align the contacts if you are not pretty easy on them. For a first timer, I would go with the jumper. Best regards, Ray "There are no easy answers in this case m'lud."

----- Original Message ----- From: "Bob Grunau" grunau.garage@sympatico.ca> To: "Donald Wilkinson" digitaldon@hotmail.com>; 1939mgtb@comcast.net>; mg-tabc@yahoogroups.com>; djedgar@pacbell.net> Sent: Monday, April 18, 2005 1:42 PM Subject: RE: [mg-tabc] Polarizing the Dynamo > > OK, sure. But nobody said anything about removing the belt. And don't you > have to cross connect the field and armature to make it motor? > But why not just jumper the field? A lot easier, and safer, than removing > the belt and mashing the points. > Bob > > > digitaldon would like to demur with all the distinguished graybeards here. > He has been using this method for decades. It is only necessary to slack > off the dynamo, releasing the belt, then mash the cutout points. It is > then > not only instantly & easily polarized, but should happily motor away, thus > confirming it's health, (if indeed it is OK). > > Don > TC 7993 > > Hi, > Don't close the contacts, you will fry the contacts and windings. Use the > jumper wire to dynamo connection method. > Are we out of kit car comments? Good. > Best regards, > Ray > > > I am doing some research on polarizing the TCs dynamo. While I know > the > > proper way is to disconnect the field wire at the control box and > flash > it > > to a battery source, are there other acceptable ways of doing this? > > > > One way in particular intrigued me, but don't know if it is true, was > to > > merely push the cut-out contacts closed. While I believe this would > > polarize the dynamo I am not sure if such action would cause any harm > like > > maybe causing the points to stick and maybe burning up windings. Has > > anyone > > tried this with favorable results or have other polarizing methods? > > > > And now back to the Morgan construction thread, > > > > David Edgar, TC 5108 > &g > > > > > Yahoo! Groups Links > > > > > > >